Shaken
The boggart had shaken him more than Remus Lupin ever would have let on to.
Once, a long time ago, Remus can remember also fearing the death of all those he loved. Once, a long time ago.
He had locked those thoughts away. They were too painful to think on, too painful to remember coming true.
What did he have left anyway?
Sirius? No, he had lost Sirius long ago.
Harry? He didn't know the boy, Harry didn't confide in him.
No, Remus had nothing.
The boggart had shaken him more than Remus Lupin ever would have let on to.